Photos: May Day marked by workers around world

Demonstrators shout slogans as they take part in the traditional Labour May Day march with French unions in Marseille May 1, 2012.

People march during a rally to celebrate International Workers' Day, or Labour Day, in Rieti, central Italy May 1, 2012.

Croatian unions demonstrate during a May Day rally in the centre of Zagreb May 1, 2012. Thousands of workers demanded that the government improve the working conditions of temporary employees.

Supporters of France's far right National Front political party walk behind a banner which reads, "French Proud and Strong" as they march at their annual annual May Day rally in Paris May 1, 2012.

Demonstrators hold a banner as they take part in the traditional Labour May Day march with French unions in Marseille May 1, 2012. The banner reads "Against austerity policies, united workers for a social progress".

Supporters of France's far right National Front political party hold flags on stage in front of a poster of Joan of Arc' statue as they listen to the speech of National Front leader Marine Le Pen in front of the Opera following the National Front's annual May Day rally in Paris May 1, 2012.

A left-wing protestor holds a placard reading "Piss off Nazis - Nobody will miss you - May 1 without Nazis" during May Day demonstrations in Neumuenster May 1, 2012.

A unionist of the Greek Communist party takes part in a May Day rally outside the Hellenic Halyvourgia, a private-owned steel plant where steelworkers have been on strike for months over job losses, at Aspropyrgos suburb in the south of Athens May 1, 2012. Thousands of workers across southern Europe protested against spending cuts in annual May Day rallies on Tuesday, before weekend elections in Greece and France where voters are expected to punish leaders for austerity.

People are reflected in a window as they march during a rally to celebrate International Workers' Day, or Labour Day, in Rieti, central Italy May 1, 2012.

A Lebanese leftist activist holds up a hammer and sickle, a symbol of communism, during a demonstration to mark Labour Day, or May Day, in Beirut May 1, 2012.

Lebanese leftist activists wave Lebanese and communist flags as they march along a street during a demonstration to mark Labour Day, or May Day, in Beirut May 1, 2012.

A woman walks in front of protesters holding placards during a rally commemorating Labour Day in Athens May 1, 2012. Thousands of Greek workers were expected to protest austerity cuts as part of annual May Day rallies on Tuesday, days before a national election that risks derailing an international bailout keeping Greece afloat. The placards read: "No Nazis in parliament".

Firefighters try to extinguish a burning campaign kiosk during a Labour Day rally in Athens May 1, 2012. Thousands of Greek workers were expected to protest austerity cuts as part of annual May Day rallies on Tuesday, days before a national election that risks derailing an international bailout keeping Greece afloat.

A woman with flowers walks past a bank after a May Day protest in central Athens May 1, 2012. Thousands of workers across southern Europe protested against spending cuts in annual May Day rallies on Tuesday, before weekend elections in Greece and France where voters are expected to punish leaders for austerity.

Greek bikers take part in a May Day protest in central Athens May 1, 2012. Thousands of workers across southern Europe protested against spending cuts in annual May Day rallies on Tuesday, before weekend elections in Greece and France where voters are expected to punish leaders for austerity.

Workers and union members hold banners and flags of the General Workers Union (UGT) and Comisiones Obreras (CCOO) during a Labour Day march in central Valencia May 1, 2012. The banner reads, "Work, dignity, rights, they want to end all of it."

People take pictures of a portrait cutout of Swiss Defence Minister Ueli Maurer burnt by protesters during a May Day demonstration in Zurich May 1, 2012.

Protesters walk in downtown Zurich during a May Day demonstration May 1, 2012. The banner is reads, "More protection, payment, pension!"

A protester wears a Guy Fawkes mask and carries a placard during a May Day demonstration in Zurich May 1, 2012.

Workers and union members hold banners and flags of the General Workers Union (UGT) and Comisiones Obreras (CCOO) during a Labour Day march in central Valencia May 1, 2012. The banner reads, "Work, dignity, rights, they want to end all of it."

Croatian workers chants slogans during a May Day rally in the center of Zagreb May 1, 2012. Thousand of workers demanded that the government improve the working conditions of temporary employees.

France's former far right National Front party leader Jean-Marie Le Pen (C) waves on stage during his speech in front of the Opera following the National Front's annual May Day rally in Paris May 1, 2012.

A man carrying a flag marches during a rally to celebrate International Workers' Day, or Labour Day, in Rieti, central Italy May 1, 2012.

Workers and union members hold banners and flags of the General Workers Union (UGT) and Comisiones Obreras (CCOO) during a Labour Day march in central Valencia May 1, 2012. The banner reads, "Work, dignity, rights, they want to end all of it."

Protesters walk in downtown Zurich during a May Day demonstration May 1, 2012. The banner is reads, "More protection, payment, pension!"